linux-kernel - [PATCH RFC 6/7] fs/ntfs: support `DISABLE_FS_CSUM

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Date:   Fri, 14 Oct 2022 08:48:36 +0000
From:   Hrutvik Kanabar <hrkanabar@...il.com>
To:     Hrutvik Kanabar <hrutvik@...gle.com>
Cc:     Marco Elver <elver@...gle.com>,
        Aleksandr Nogikh <nogikh@...gle.com>,
        kasan-dev@...glegroups.com,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Theodore Ts'o <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        linux-ext4@...r.kernel.org, Chris Mason <clm@...com>,
        Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org,
        Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>,
        linux-f2fs-devel@...ts.sourceforge.net,
        "Darrick J . Wong" <djwong@...nel.org>, linux-xfs@...r.kernel.org,
        Namjae Jeon <linkinjeon@...nel.org>,
        Sungjong Seo <sj1557.seo@...sung.com>,
        Anton Altaparmakov <anton@...era.com>,
        linux-ntfs-dev@...ts.sourceforge.net
Subject: [PATCH RFC 6/7] fs/ntfs: support `DISABLE_FS_CSUM_VERIFICATION` config option

From: Hrutvik Kanabar <hrutvik@...gle.com>

When `DISABLE_FS_CSUM_VERIFICATION` is enabled, bypass checksum
verification in `is_boot_sector_ntfs`.

Signed-off-by: Hrutvik Kanabar <hrutvik@...gle.com>
---
 fs/ntfs/super.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/ntfs/super.c b/fs/ntfs/super.c
index 001f4e053c85..428c65ce9a80 100644
--- a/fs/ntfs/super.c
+++ b/fs/ntfs/super.c
@@ -582,7 +582,8 @@ static bool is_boot_sector_ntfs(const struct super_block *sb,
 
 		for (i = 0, u = (le32*)b; u < (le32*)(&b->checksum); ++u)
 			i += le32_to_cpup(u);
-		if (le32_to_cpu(b->checksum) != i)
+		if (!IS_ENABLED(CONFIG_DISABLE_FS_CSUM_VERIFICATION) &&
+		    le32_to_cpu(b->checksum) != i)
 			ntfs_warning(sb, "Invalid boot sector checksum.");
 	}
 	/* Check OEMidentifier is "NTFS    " */
-- 
2.38.0.413.g74048e4d9e-goog